'use strict'

var domQuery = require('min-dom').query
var domClasses = require('min-dom').classes
var domify = require('min-dom').domify
var bind = require('lodash/bind')

/**
 * @class
 * @constructor
 */
function Popup(options) {
  options = options || {}
  this.template = options.template || this.template
  var el = this.el = domify(this.template)

  this.header = domQuery('.popup-header', el)
  this.body = domQuery('.popup-body', el)
  this.footer = domQuery('.popup-footer', el)

  document.body.appendChild(el)

  this._attachEvents()
}

Popup.prototype.template = '<div class="bpp-properties-panel-popup">' +
                              '<div class="underlay"></div>' +
                              '<div class="popup">' +
                                '<button class="popup-close"><span>Close</span></button>' +
                                '<div class="popup-header"></div>' +
                                '<div class="popup-body"></div>' +
                                '<div class="popup-footer"></div>' +
                              '</div>' +
                            '</div>'

Popup.prototype._attachEvents = function() {
  var self = this
  var events = this.events
  var el = this.el

  Object.keys(events).forEach(function(instruction) {
    var cb = bind(self[events[instruction]], self)
    var parts = instruction.split(' ')
    var evtName = parts.shift()
    var target = parts.length ? parts.shift() : false
    target = target ? domQuery(target, el) : el
    if (!target) { return }
    target.addEventListener(evtName, cb)
  })
}

Popup.prototype._detachEvents = function() {
  var self = this
  var events = this.events
  var el = this.el

  Object.keys(events).forEach(function(instruction) {
    var cb = bind(self[events[instruction]], self)
    var parts = instruction.split(' ')
    var evtName = parts.shift()
    var target = parts.length ? parts.shift() : false
    target = target ? domQuery(target, el) : el
    if (!target) { return }
    target.removeEventListener(evtName, cb)
  })
}

Popup.prototype.events = {
  // 'keydown:esc':        '_handleClose',
  'click .underlay': '_handleClose',
  'click .popup-close': '_handleClose'
}

Popup.prototype._handleClose = function(evt) {
  this.close()
}

Popup.prototype.open = function(content) {
  domClasses(this.el).add('open')
}

Popup.prototype.close = function() {
  domClasses(this.el).remove('open')
}

Popup.prototype.remove = function() {
  this._detachEvents()
  if (document.body.contains(this.el)) {
    document.body.removeChild(this.el)
  }
}

var popup
module.exports = function() {
  if (!popup) {
    popup = new Popup()
  }
  return popup
}
